title: Cavity-enhanced spectroscopy of a rare-earth-ion-doped crystal: observation of a power law for inhomogeneous broadening.
abstract: We experimentally demonstrate cavity-enhanced spectroscopy of a rare-earth-ion-doped crystal (Pr³⁺:Y₂SiO₅). We succeeded in observing very small absorption due to the ions appropriately prepared by optical pumping, which corresponds to the single-pass absorption of 4 × 10-6. We also observed a power law for the inhomogeneous broadening of optical transitions of ions in the crystal. Compared with a theoretical model, the result of the power law indicates that the dominant origin of the inhomogeneous broadening may be some charged defects.
authors.forename: Hayato
authors.initials: H
authors.lastname: Goto
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nakamura
authors.forename: Mamiko
authors.initials: M
authors.lastname: Kujiraoka
authors.forename: Kouichi
authors.initials: K
authors.lastname: Ichimura